EP 0891131 B1 20011004 - AQUARIUM UNDERGRAVEL FILTER
Title (en)
AQUARIUM UNDERGRAVEL FILTER
Title (de)
UNTER EINER KIESSCHICHT LIEGENDE AQUARIUMFILTER
Title (fr)
FILTRE POUR AQUARIUM PLACE SOUS LE GRAVIER
Publication
Application
Priority
- US 9703884 W 19970312
- US 62882496 A 19960405
Abstract (en)
[origin: US5667672A] The present invention is directed to an aquarium undergravel filter. In particular, the undergravel filter of the present invention contains chambers on its underside. The chambers, which are roughly equal in size, are separated by baffles and have openings which allow water to flow into flow channels which lead to the lift tube holes. The chambers and flow channels provide for equal filtration over the entire surface of the filter plate. In a preferred embodiment, the undergravel filter of the present invention also contains an anti-dig grid which prevents fish from digging the gravel on the plate of the filter by use of an anti-dig grid. The anti-dig grid is located on the top surface of the filter and prevents fish from removing the gravel and exposing the openings in the filter.
IPC 1-7
IPC 8 full level
A01K 63/04 (2006.01)
CPC (source: EP US)
A01K 63/045 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
US 5667672 A 19970916; AU 2207497 A 19971029; AU 709316 B2 19990826; CA 2249553 A1 19971016; DE 69707119 D1 20011108; DE 69707119 T2 20020704; EP 0891131 A2 19990120; EP 0891131 A3 20010801; EP 0891131 B1 20011004; JP 2000511770 A 20000912; WO 9737531 A2 19971016; WO 9737531 A3 20010525
DOCDB simple family (application)
US 62882496 A 19960405; AU 2207497 A 19970312; CA 2249553 A 19970312; DE 69707119 T 19970312; EP 97915023 A 19970312; JP 53620097 A 19970312; US 9703884 W 19970312